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Equity and Stock-Based Compensation - Additional Information (Details) - USD ($) |  |  |  |  | 12 Months Ended | 84 Months Ended | 120 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 29, 2018 | Mar. 28, 2018 | Aug. 23, 2017 | Aug. 18, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 1996 | Dec. 31, 2015 | Dec. 31, 2014 | Apr. 30, 2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |
Total cost of shares repurchased and retired |  |  |  |  |  | $ 4,000,000 |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 573,000 | $ 855,000 | $ 1,328,000 |  |  |  |
Compensation cost on non-vested stock options not yet recognized |  |  |  |  | $ 400,000 |  |  |  |  |  |
Compensation cost, expected weighted-average recognition period |  |  |  |  | 1 year 7 months 20 days |  |  |  |  |  |
Shares available to grant |  |  |  |  | 956,053 |  |  |  |  |  |
2007 Employee Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available to grant |  |  |  |  | 856,453 |  |  |  |  |  |
2007 Employee Stock Incentive Plan | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available to grant |  |  |  |  |  |  |  |  |  |  | 500,000
Number of additional shares authorized |  |  |  |  |  |  |  |  | 2,500,000 |  |
Non-Employee Directors Stock Option Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares available to grant |  |  |  |  | 99,600 |  |  |  |  |  |
Non-Employee Directors Stock Option Plan | Stock Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of additional shares authorized |  |  |  |  |  |  |  |  |  | 400,000 |
Share-based compensation, shares issued |  |  |  |  |  |  |  | 100,000 |  |  |
2018 Stock Repurchase Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program period |  | 1 year |  |  |  |  |  |  |  |  |
Authorized stock repurchase amount |  | $ 4,000,000 |  |  |  |  |  |  |  |  |
Common stock, par value |  | $ 0.01 |  |  |  |  |  |  |  |  |
Shares repurchased and retired during the period |  |  |  |  |  | 771,149 |  |  |  |  |
Total cost of shares repurchased and retired |  |  |  |  |  | $ 4,000,000 |  |  |  |  |
Average price per share of shares repurchased |  |  |  |  |  | $ 5.19 |  |  |  |  |
2019 Stock Repurchase Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program period | 1 year |  |  |  |  |  |  |  |  |  |
Authorized stock repurchase amount | $ 4,000,000 |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ 0.01 |  |  |  |  |  |  |  |  |  |
Shares repurchased and retired during the period |  |  |  |  | 0 |  |  |  |  |  |
Offering |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares sold |  |  | 1,213,250 | 1,055,000 |  |  |  |  |  |  |
Sale of stock price per share |  |  | $ 9.50 | $ 9.50 |  |  |  |  |  |  |
Proceeds from sale of stock |  |  | $ 10,600,000 |  |  |  |  |  |  |  |
Over-Allotment Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of shares sold |  |  |  | 158,250 |  |  |  |  |  |  |

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